A massive multistory parking garage under construction in downtown Los Angeles partially collapsed Friday morning but no one was injured, fire and transit officials said.

Officials said a concrete pour was being conducted around 6:30 a.m. when a worker responsible for monitoring the pour heard an unusual sound and radioed to get everyone off the construction site. Shortly before 8:50 all workers had cleared the area, and around that time part of the structure went down, said Metro spokesman Paul Gonzales.

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"All the safety procedures worked as designed," he said.

The garage is located in the 800 block of Keller Street officials said. When complete, it will take up about half a city block, Gonzales said. It is part of a larger MTA project that will build a "modern, state-of-the-art bus maintenance facility to the area," Gonzales said.

"This is going to need to be investigated," Gonzales said. "Our target time to complete this was this summer -- so that will be delayed."

An aerial photo of the site showed metal strewn across the ground and collapsed pieces of a roof near a crane.

Gonzales said officials were still on scene more than an hour later, but he was not aware of any surrounding roads that were closed. he said a "thorough investigation" is being conducted by Metro and a contract and design firm associated with the project.

He said about 180 workers were on the project site Friday morning.

"Everybody has been accounted for … which we're thankful for," he said.